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doc: make it easier to read how to enable extensions...
doc: make it easier to read how to enable extensions We tell people all the time that enabling extensions is not a scary thing to do, but we don't make it easy enough for an absolute novice to do so. When they see a suggestion to do "hg extfoo bar", the error message tells them "see hg help extensions", but that help page doesn't actually tell them where configuration files are. Furthermore, the big warning about why extensions aren't enabled by default should be pushed down a little bit. Most of the extensions shipped by hg are not all that scary, and some very basic and useful cosmetic extensions like graphlog, color, pager, and progress, should be enabled for many hg users.

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r19296:da16d21c stable
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revisions.txt
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Mercurial supports several ways to specify individual revisions.
A plain integer is treated as a revision number. Negative integers are
treated as sequential offsets from the tip, with -1 denoting the tip,
-2 denoting the revision prior to the tip, and so forth.
A 40-digit hexadecimal string is treated as a unique revision
identifier.
A hexadecimal string less than 40 characters long is treated as a
unique revision identifier and is referred to as a short-form
identifier. A short-form identifier is only valid if it is the prefix
of exactly one full-length identifier.
Any other string is treated as a bookmark, tag, or branch name. A
bookmark is a movable pointer to a revision. A tag is a permanent name
associated with a revision. A branch name denotes the tipmost revision
of that branch. Bookmark, tag, and branch names must not contain the ":"
character.
The reserved name "tip" always identifies the most recent revision.
The reserved name "null" indicates the null revision. This is the
revision of an empty repository, and the parent of revision 0.
The reserved name "." indicates the working directory parent. If no
working directory is checked out, it is equivalent to null. If an
uncommitted merge is in progress, "." is the revision of the first
parent.